Improvement in drilling-machines



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0. SMITH. Drilling-Machine.

No 222,321. Patented Dec. 2,1879.

"l l lummwa aim' i N. PEI'ERS, mOTD-IJTNOGRAPHER. WASHXNG'TOM D. C.

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0. SMITH. Drilling-Machine.

No. 222,321. Patented Dec.- 2,1879.

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N. PETERS PHOTOJ rrl-lnGnAFHER. WASHINGTON n C 4 sheets sheet 3.

0. SMITH. Drilling-Machine.

N01; 222,321 Patented Dec. 2, I879.-

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0. SMITH. Drilling-Machine.

Patented Dec.2,1879.

\ UNITED STATE PATENT 'Q'FFFIG'E.

' oBEEnr SMITH, OF .BRIDGETON, NEW JERsEY.

IMPROVEMENT l N DRILLING-MACHINES.

. Specification forming part of Letters PatentNou222g32l, dated December 2, 1879; application filed "November 6, 1878.

To all whom it may concern:

Be it known that I, OBE-ELIN- "SMITH, of Bridgeton, in thecounty of Cumberland, and in the Stateof New J ersey, have invented certain new and nsefulqlmprovements lin Goinbined Drill Press and Centering Machine;

and I do hereby declare that thefollowi-ng is a full, clear,an'd-exact description thereof, reference being had to thelaccompanying drawings, making apart of this "specification, in which- Figure 1 is-a perspective view of myxmachine when arranged with the drill in "a vertical position. Fig. 2 isla-like View of the same arranged obliquely. Fig. 3 isavertical central section upon a line passing from front to rear. Fig. 4 is a central longitudinalsection of the idler-pulleys and'bearing-stud upona vertical line. Fig.5 is an'enlargedperspecti veview of the feed-wheel, friction-cap, and operating-knob I employed for raising the drill-spindle rapidly,

said parts being separated from each other, Fig. 6 is a vertical centralsection of the same,

- the full lines showing thenormal position of parts, and the dotted lines-their positionwhen the feed-Wheel and qcap are inengagement.

Fig.1 is aperspectivelview of the adj ustable bearing for the lowerendof'theuspindle, the.

parts being separated *from each other; .and Figs. 8 .and 9 are, respectively, vertical and horizontal sections of the'sam' i "Letters of like name; and kindreferto like parts in each of the-figures.

The object of my invention'is to increase the efficiency andease of operation-of .drill presses and centering-machines; and to this "end it consists, principally, in'combining, with a cone-pulley and a s'pindlepulley whose axes are arranged at right angles 'to each, other,

idler-pulleys whose axes are arranged at a right angle to each of the same, and capable of adjustment toward. or from saidspindlepulley,-substantially. as and for the purpose hereinafter shown.

It consists, further, in the means employed for locking the shaft which supports the idlerpulleys, and upon which theyrare journaled, in position within' or upon] its support, substantially as and for thepurpose hereinafter set forth.

It consists, further, in the means employed forprovidin g an adjustable co m pensating-bearing for the lower portion of the drill-spindle, substantially as and for the purpose hereinaf- =ter-shown and described.

It consists, further, in the means employed for enabling the rotary motion of the drillspin'dle to raisesaid spindle, substantially as and the purpose hereinafter specified.

It consists,finally, in the machine asa whole, its several parts being constructed and com bined to operate substantiallyas and for the purpose hereinafter set forth.

In the=annexed drawings,-A represents the pedestal of my machine, constructed with a broad base and provided at its upper end with a cylindrical enlargement, a, through the axis of which is a round horizontal opening, a, that receives and contains a shaft, B, said shaft being held firmly in position therein by means of a set-screw, O. Y

The principal portion of the shaftB projects from one side of the pedestal A, and upon the same is journaled a cone-pulley, D, and a loose pulley, E, sai'd pulleys being held in position by means of a nut, 11, upon the outer threaded threadedouter end of said shaft B enables said frameto be clamped in position upon the latter. r V

Thefeed screw or sleeve H is journaled upon the drill-spindle G, so as to be capable of rotation, but not to have longitudinal motion thereon, and has its threaded exterior contained with in a correspon din gly-th readed opening, which passes vertically through the arm f, the arrangement being such as to cause said screw H, and with it said spindle, to rise or fall when the former is rotatedupon the latter,

all in the usual manner.

A hand-wheel, h, attached to the upper end of the screw-sleeve H, enables the latter to be rotated when it is desired to raise or lower the spindle Gr. A

Within an opening, f in the'arm f is placed a cylindrical block, I, which is held centrally in place by means of three set-screws, K, that pass radially inward through said arm from equidistant points, and at their inner ends impinge upon the periphery of said block. The opening within said block is slightly larger at its upper than at its lower end, and is threaded, and receives a box or bushing, L, which exteriorly is correspondingly tapered and threaded, and interiorly corresponds to and receives the spindle G. Said bushing L is split at one side upon a longitudinal radial line, so that by screwing it downward within said block it will be compressed so as to reduce its interior dimensions and enable the wear of parts to be compensated for.

Motion is imparted to the spindle G by means of a belt, M, which passes from the cone D over two idler-pulleys, N and N, which are arranged horizontally and at a right angle with said cone, and thence around a pulley, O, that is secured upon said spindle. The pulleys .N are journaled upon a shaft, 1, which passes through an arm, F, that extends horizontally rearward over the shaft B, and is provided with a horizontal longitudinal slot, f, for the reception of said shaft.

The central portion of the shaft P is somewhat enlarged, and such portion 1) is provided with a right and a left hand thread, which threads extend from the center outward in opposite directions, and each receives a correspondingly-threaded nut, Q. The inner face of each of said nuts is rabbeted at its upper and lower sides, so as to permit its central portion to extend into the slot f and prevent the rotation of said nut as said shaft is turned.

As thus arranged, it will be seen that by turning the shaft P in one direction-preferably forwardthe nuts Q will be moved apart, while by turning said shaft in an opposite direction said nuts will be moved toward each other and caused to bear firmly against the arm F, so as to confine said shaft in place, by which means the latter may be moved to and secured in position at different points, to enable the belt M to pass around any of the pulleys of the cone D.

The relative proportions of the pulleys of the cone D are such that by moving the idlerpulleys N to the right position to enable them to act as guides the belt M will ordinarily have the necessary tension but should it be too loose or too tight, a sufficient change can be made in the position of the shaft P to remedy such difficulty.

The shaft P is turned by means of two crankarms, B, one of which is secured upon each end, and when said shaft is clamped in position extends upward beside the outer end of the pulley N upon the same end of the latter, in which position said arm operates as a guide for the belt-M. An arm, q, extending upward from each nut Q, operates as a guide for the inner edge of said belt.

The arrangement of pulleys described enables a variety of changes in the speed of the spindle to be had with the use of one cone-pulley, while heretofore two cones have been required in order to secure the same result.

Outside the cone;pulley D is journaled a loose pulley, D, which receives the drivingbelt, and from which said belt maybe run upon a fixed pulley that is attached to and forms part of said cone. Below its pivotal bearing the frame F has parallel rearwardly-beveled edges, and upon such part is fitted a table, S, that is capable of vertical adjustment, and when in position is securely clamped by setscrews s, which pass inward through its jaws, all in the usual manner.

The table Sis provided with a round opening, S, which has the same axis as the spindle G, and within the same or forming part of said table is arranged a scroll-chuck, T, for centering and holding in position the shaft or other part being drilled. Said chuck has preferably four jaws, such number having been found best adapted to the holding of pieces having different shapes.

In order that, after a part has been drilled, the spindle G may be quickly raised to its highest point, the following-described means may be employed: Upon the upper side of a hand-wheel, h, which is secured upon the upper end of the feed-screw H, is provided a raised part, h, that has a conical form, and over the same is fitted a cap, U, which corresponds upon its lower face to the shape of said 7 part h.

The cap U has a square opening at its center,.and is loosely fitted over a squared portion, 9, of the upper end of the spindle G, the arrangement being such as to cause said cap to rotate with said spindle, while free to move vertically within certain limits.

Between the shoulder formed by squaring the upper end of the spindle G and the lower face of the cap U is placed a spring, V, which operates to raise said cap from contact with the hand-wheel h, while, by means of a knob, W, placed around and held loosely in position upon the upper end of said spindle and capable of a certain degree of vertical motion, said cap may be pressed downward and caused to engage with said hand-wheel, so that if said spindle is rotating said hand-wheel and the feed-screw will be moved in the same direction.

The screw-thread upon the feed-screw H turns to the left, so that when the spindle G is in motion, and the friction-cap U is caused to engage with the feed-wheel h, said screw will be caused to rotate in the same direction and raise said spindle.

In order that the spindle G may not be raised accidentally above the proposed point, a stop, Y, preferably covered with rubber, projects outward from the upper end of the frame F, and, when said spindle reaches its upper limit, engages with the periphery of the handwheel h, and arrests further movement of the latter, the friction of said lug being snfficient to overcome the friction of the cap U.

This device may be used either as a drillpress or a centering-machine, for either ofwhieh purposes the frame is adjustable to any desired angle, so as to accommodate the drill to the position of the shaft or other part to be drilled.

Forcentering purposes it is only necessary to insert the end of a shaft within the chuck and tighten the jaws of the latter, when the center of said shaft will be brought into line with the drill with certainty and case.

When a long shaft is tobe centered it is only necessary that the end to be operated upon should be raised from the floor and placed within the chuck, the frame having been loosened and turned to the necessary position,

'when, by tightening the jaws of said chuck, said frame will automatically adjust itself to position to bring the drill accurately ina line axially with said shaft.

Asthe frameis journaled upon the shaft which furnishes a bearing for the cone-pulley employed for driving the spindle, changes in the position of said frame have no effect upon the belt, the relative positions of the pulleys remaining the same under all circumstances.

Having thus fully set forth the nature and merits of my invention, what I claim as new tion, and at their inner sides engagingloosely with said arm, said parts being combined in the manner and for the purpose substantially as set forth.

3, As a means for centering the lower portion of the spindle G, and for furnishing therefor a compensating-bearing, the block I, placed within the opening f" of the frame-armf, and adjusted to and secured in axial position by means of the set-screws K, and the box or bushin g L, fitted upon said spindle, split at one side, and havingatapering threaded peripherywhich fits into a correspondingly -tapered threaded axial opening in said block, said parts being combined in the manner and for the purpose substantially as shown and described.

4. In combination with the spindle G" and with the feed-screw H, the hand-wheel h, having the conical raised part h, the cap U, corresponding upon its lower face to said conical part and arranged to revolve with'and move vertically upon the upper end of said spindle, the spring V, placed beneath said cap, and the knob W, sliding upon the upper end of said spindle and operating to depress saidcap, substantially as and for the purpose specified.

5. The hereinbefore-described machine, in which the pedestal A, shaft B, carrying the cone-pulleys D, the frame F, carrying the spindle Gr, feed-screw H, idler-pulleys N, and chucktable S are constructed and combined to operate in the manner and for the purpose substantially as shown.

In testimony that I claim the foregoing I have hereunto set my hand this 4th day of November, 1878. V

OBERLIN SMITH. WVitnesses:

FRANCES S. HILL, CHARLOTTE E. SMITH. 

